Risible is sometimes used as a noun, in the plural, for the feeling of amusement and for the muscles and other organs used in laughing, collectively; as, unable to control one's risibles.
[1913 Webster]

Syn. -- Ludicrous; laughable; amusing; ridiculous -- Risible, Ludicrous, Ridiculous. Risible differs from ludicrous as species from genus; ludicrous expressing that which is playful and sportive; risible, that which may excite laughter. Risible differs from ridiculous, as the latter implies something contemptuous, and risible does not.
[1913 Webster]

--Ris"i*ble*ness(#),
n. -- Ris"i*bly,
adv.
[1913 Webster]

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